I have attached twb file for your reference. When I opened , min,max and avg were already calculated using reference line. As far as coloring between min and max is concerned, you just need to provide the color in "Fill" when editing refrence line

Thanks Nitin. I did manage to get the average, min and max lines, however, these are straight averages of the data. What I guess meant to say was I would like the average,min and max for each month within the filtered dataset. I assume this is how the average data has been computed on the link I provided (see below).

So instead of a 1981 - 2010 Median, I would like to compute a 2009 - 2018 arithmetic average.